a person of supreme or complete power, authority, ability, etc.: His victory makes him the new chess supremo.
Origin: 1935–40; < Sp or It supremo, both < L suprēmussupreme1; E sense perh. esp. < Sp El Supremo as the title of Latin-American dictators, e.g., J. G. Rodríguez Francia (1766–1840), Paraguayan dictator